./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive-simple/afterrec-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version e943c265 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4af12e5f-6993-47fb-9b5f-47b57ca9c8f0/bin/utaipan-tZwUujhuQw/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4af12e5f-6993-47fb-9b5f-47b57ca9c8f0/bin/utaipan-tZwUujhuQw/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4af12e5f-6993-47fb-9b5f-47b57ca9c8f0/bin/utaipan-tZwUujhuQw/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4af12e5f-6993-47fb-9b5f-47b57ca9c8f0/bin/utaipan-tZwUujhuQw/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/afterrec-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4af12e5f-6993-47fb-9b5f-47b57ca9c8f0/bin/utaipan-tZwUujhuQw/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4af12e5f-6993-47fb-9b5f-47b57ca9c8f0/bin/utaipan-tZwUujhuQw --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash bd3dbeb1201d252c8f1e3c61a135802ff8f8ccfcc09353f09b9750e3ee951591 .................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE --- Real Ultimate output --- This is Ultimate 0.2.1-dev-e943c26 [2021-10-20 05:13:04,357 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-10-20 05:13:04,361 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-10-20 05:13:04,417 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-10-20 05:13:04,418 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-10-20 05:13:04,422 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-10-20 05:13:04,424 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-10-20 05:13:04,428 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-10-20 05:13:04,431 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-10-20 05:13:04,436 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-10-20 05:13:04,438 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-10-20 05:13:04,440 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-10-20 05:13:04,440 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-10-20 05:13:04,443 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-10-20 05:13:04,445 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-10-20 05:13:04,449 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-10-20 05:13:04,451 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-10-20 05:13:04,452 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-10-20 05:13:04,455 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-10-20 05:13:04,463 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-10-20 05:13:04,465 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-10-20 05:13:04,466 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-10-20 05:13:04,468 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-10-20 05:13:04,469 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-10-20 05:13:04,472 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-10-20 05:13:04,473 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-10-20 05:13:04,473 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-10-20 05:13:04,474 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-10-20 05:13:04,475 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-10-20 05:13:04,476 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-10-20 05:13:04,476 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-10-20 05:13:04,477 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-10-20 05:13:04,479 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-10-20 05:13:04,480 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-10-20 05:13:04,482 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-10-20 05:13:04,482 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-10-20 05:13:04,483 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-10-20 05:13:04,483 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-10-20 05:13:04,484 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-10-20 05:13:04,485 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-10-20 05:13:04,485 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-10-20 05:13:04,487 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4af12e5f-6993-47fb-9b5f-47b57ca9c8f0/bin/utaipan-tZwUujhuQw/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-10-20 05:13:04,526 INFO L113 SettingsManager]: Loading preferences was successful [2021-10-20 05:13:04,527 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-10-20 05:13:04,528 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-10-20 05:13:04,528 INFO L138 SettingsManager]: * User list type=DISABLED [2021-10-20 05:13:04,528 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-10-20 05:13:04,529 INFO L138 SettingsManager]: * Explicit value domain=true [2021-10-20 05:13:04,529 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-10-20 05:13:04,529 INFO L138 SettingsManager]: * Octagon Domain=false [2021-10-20 05:13:04,535 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-10-20 05:13:04,536 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-10-20 05:13:04,537 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-10-20 05:13:04,537 INFO L138 SettingsManager]: * Interval Domain=false [2021-10-20 05:13:04,537 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-10-20 05:13:04,537 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-10-20 05:13:04,538 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-10-20 05:13:04,539 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-10-20 05:13:04,539 INFO L138 SettingsManager]: * sizeof long=4 [2021-10-20 05:13:04,539 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-10-20 05:13:04,539 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-10-20 05:13:04,540 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-10-20 05:13:04,540 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-10-20 05:13:04,540 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-10-20 05:13:04,540 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-10-20 05:13:04,540 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-10-20 05:13:04,541 INFO L138 SettingsManager]: * sizeof long double=12 [2021-10-20 05:13:04,541 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-10-20 05:13:04,541 INFO L138 SettingsManager]: * Use constant arrays=true [2021-10-20 05:13:04,541 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-10-20 05:13:04,541 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-10-20 05:13:04,543 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-10-20 05:13:04,543 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-20 05:13:04,543 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-10-20 05:13:04,544 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-10-20 05:13:04,544 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-10-20 05:13:04,544 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-10-20 05:13:04,544 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-10-20 05:13:04,545 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-10-20 05:13:04,545 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-10-20 05:13:04,545 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-10-20 05:13:04,545 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4af12e5f-6993-47fb-9b5f-47b57ca9c8f0/bin/utaipan-tZwUujhuQw/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4af12e5f-6993-47fb-9b5f-47b57ca9c8f0/bin/utaipan-tZwUujhuQw Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> bd3dbeb1201d252c8f1e3c61a135802ff8f8ccfcc09353f09b9750e3ee951591 [2021-10-20 05:13:04,893 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-10-20 05:13:04,915 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-10-20 05:13:04,918 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-10-20 05:13:04,919 INFO L271 PluginConnector]: Initializing CDTParser... [2021-10-20 05:13:04,920 INFO L275 PluginConnector]: CDTParser initialized [2021-10-20 05:13:04,921 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4af12e5f-6993-47fb-9b5f-47b57ca9c8f0/bin/utaipan-tZwUujhuQw/../../sv-benchmarks/c/recursive-simple/afterrec-1.c [2021-10-20 05:13:05,008 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4af12e5f-6993-47fb-9b5f-47b57ca9c8f0/bin/utaipan-tZwUujhuQw/data/09f5b546e/7ca6694f90c34e2388aff50d7d2a80af/FLAG02b4c1d43 [2021-10-20 05:13:05,430 INFO L306 CDTParser]: Found 1 translation units. [2021-10-20 05:13:05,430 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4af12e5f-6993-47fb-9b5f-47b57ca9c8f0/sv-benchmarks/c/recursive-simple/afterrec-1.c [2021-10-20 05:13:05,435 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4af12e5f-6993-47fb-9b5f-47b57ca9c8f0/bin/utaipan-tZwUujhuQw/data/09f5b546e/7ca6694f90c34e2388aff50d7d2a80af/FLAG02b4c1d43 [2021-10-20 05:13:05,817 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4af12e5f-6993-47fb-9b5f-47b57ca9c8f0/bin/utaipan-tZwUujhuQw/data/09f5b546e/7ca6694f90c34e2388aff50d7d2a80af [2021-10-20 05:13:05,819 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-10-20 05:13:05,821 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-10-20 05:13:05,822 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-10-20 05:13:05,822 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-10-20 05:13:05,825 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-10-20 05:13:05,826 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.10 05:13:05" (1/1) ... [2021-10-20 05:13:05,827 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@59048347 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 05:13:05, skipping insertion in model container [2021-10-20 05:13:05,828 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.10 05:13:05" (1/1) ... [2021-10-20 05:13:05,835 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-10-20 05:13:05,846 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-10-20 05:13:06,021 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4af12e5f-6993-47fb-9b5f-47b57ca9c8f0/sv-benchmarks/c/recursive-simple/afterrec-1.c[318,331] [2021-10-20 05:13:06,025 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-20 05:13:06,035 INFO L203 MainTranslator]: Completed pre-run [2021-10-20 05:13:06,052 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4af12e5f-6993-47fb-9b5f-47b57ca9c8f0/sv-benchmarks/c/recursive-simple/afterrec-1.c[318,331] [2021-10-20 05:13:06,053 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-20 05:13:06,066 INFO L208 MainTranslator]: Completed translation [2021-10-20 05:13:06,067 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 05:13:06 WrapperNode [2021-10-20 05:13:06,067 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-10-20 05:13:06,069 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-10-20 05:13:06,069 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-10-20 05:13:06,070 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-10-20 05:13:06,077 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 05:13:06" (1/1) ... [2021-10-20 05:13:06,084 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 05:13:06" (1/1) ... [2021-10-20 05:13:06,099 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-10-20 05:13:06,100 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-10-20 05:13:06,100 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-10-20 05:13:06,101 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-10-20 05:13:06,109 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 05:13:06" (1/1) ... [2021-10-20 05:13:06,109 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 05:13:06" (1/1) ... [2021-10-20 05:13:06,111 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 05:13:06" (1/1) ... [2021-10-20 05:13:06,112 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 05:13:06" (1/1) ... [2021-10-20 05:13:06,117 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 05:13:06" (1/1) ... [2021-10-20 05:13:06,119 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 05:13:06" (1/1) ... [2021-10-20 05:13:06,120 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 05:13:06" (1/1) ... [2021-10-20 05:13:06,128 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-10-20 05:13:06,129 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-10-20 05:13:06,129 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-10-20 05:13:06,130 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-10-20 05:13:06,136 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 05:13:06" (1/1) ... [2021-10-20 05:13:06,143 INFO L170 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-20 05:13:06,155 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4af12e5f-6993-47fb-9b5f-47b57ca9c8f0/bin/utaipan-tZwUujhuQw/z3 [2021-10-20 05:13:06,166 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4af12e5f-6993-47fb-9b5f-47b57ca9c8f0/bin/utaipan-tZwUujhuQw/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-10-20 05:13:06,191 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4af12e5f-6993-47fb-9b5f-47b57ca9c8f0/bin/utaipan-tZwUujhuQw/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-10-20 05:13:06,214 INFO L130 BoogieDeclarations]: Found specification of procedure f [2021-10-20 05:13:06,214 INFO L138 BoogieDeclarations]: Found implementation of procedure f [2021-10-20 05:13:06,216 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-10-20 05:13:06,216 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-10-20 05:13:06,216 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-10-20 05:13:06,217 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-10-20 05:13:06,449 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-10-20 05:13:06,455 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2021-10-20 05:13:06,470 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.10 05:13:06 BoogieIcfgContainer [2021-10-20 05:13:06,470 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-10-20 05:13:06,472 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-10-20 05:13:06,487 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-10-20 05:13:06,491 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-10-20 05:13:06,491 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.10 05:13:05" (1/3) ... [2021-10-20 05:13:06,492 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1293503a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.10 05:13:06, skipping insertion in model container [2021-10-20 05:13:06,492 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 05:13:06" (2/3) ... [2021-10-20 05:13:06,493 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1293503a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.10 05:13:06, skipping insertion in model container [2021-10-20 05:13:06,493 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.10 05:13:06" (3/3) ... [2021-10-20 05:13:06,494 INFO L111 eAbstractionObserver]: Analyzing ICFG afterrec-1.c [2021-10-20 05:13:06,499 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-10-20 05:13:06,515 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-10-20 05:13:06,563 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-10-20 05:13:06,575 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-10-20 05:13:06,584 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-10-20 05:13:06,599 INFO L276 IsEmpty]: Start isEmpty. Operand has 11 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 7 states have internal predecessors, (8), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-10-20 05:13:06,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-10-20 05:13:06,603 INFO L504 BasicCegarLoop]: Found error trace [2021-10-20 05:13:06,604 INFO L512 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-20 05:13:06,604 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting fErr0ASSERT_VIOLATIONERROR_FUNCTION === [fErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-20 05:13:06,610 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-20 05:13:06,610 INFO L82 PathProgramCache]: Analyzing trace with hash -1868822515, now seen corresponding path program 1 times [2021-10-20 05:13:06,620 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-20 05:13:06,621 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [439712933] [2021-10-20 05:13:06,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-20 05:13:06,622 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-20 05:13:06,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-20 05:13:06,837 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-20 05:13:06,837 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-20 05:13:06,838 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [439712933] [2021-10-20 05:13:06,839 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [439712933] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-20 05:13:06,839 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [127607452] [2021-10-20 05:13:06,839 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-20 05:13:06,840 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-20 05:13:06,840 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4af12e5f-6993-47fb-9b5f-47b57ca9c8f0/bin/utaipan-tZwUujhuQw/z3 [2021-10-20 05:13:06,842 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4af12e5f-6993-47fb-9b5f-47b57ca9c8f0/bin/utaipan-tZwUujhuQw/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-20 05:13:06,854 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4af12e5f-6993-47fb-9b5f-47b57ca9c8f0/bin/utaipan-tZwUujhuQw/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-10-20 05:13:06,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-20 05:13:06,922 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-20 05:13:06,927 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-20 05:13:07,033 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-20 05:13:07,033 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-20 05:13:07,187 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-20 05:13:07,187 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [127607452] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-20 05:13:07,188 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [901457923] [2021-10-20 05:13:07,211 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-10-20 05:13:07,212 INFO L166 IcfgInterpreter]: Building call graph [2021-10-20 05:13:07,217 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:608) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-20 05:13:07,219 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-20 05:13:07,220 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 8 [2021-10-20 05:13:07,222 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [831703497] [2021-10-20 05:13:07,226 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-10-20 05:13:07,227 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-20 05:13:07,239 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-10-20 05:13:07,239 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2021-10-20 05:13:07,241 INFO L87 Difference]: Start difference. First operand has 11 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 7 states have internal predecessors, (8), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 8 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 7 states have internal predecessors, (9), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-20 05:13:07,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-20 05:13:07,309 INFO L93 Difference]: Finished difference Result 18 states and 22 transitions. [2021-10-20 05:13:07,310 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-10-20 05:13:07,311 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 7 states have internal predecessors, (9), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 10 [2021-10-20 05:13:07,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-20 05:13:07,321 INFO L225 Difference]: With dead ends: 18 [2021-10-20 05:13:07,321 INFO L226 Difference]: Without dead ends: 12 [2021-10-20 05:13:07,325 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 17 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 79.3ms TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2021-10-20 05:13:07,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2021-10-20 05:13:07,359 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2021-10-20 05:13:07,360 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 7 states have (on average 1.1428571428571428) internal successors, (8), 8 states have internal predecessors, (8), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-20 05:13:07,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2021-10-20 05:13:07,363 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2021-10-20 05:13:07,363 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-20 05:13:07,364 INFO L470 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2021-10-20 05:13:07,365 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 7 states have internal predecessors, (9), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-20 05:13:07,365 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2021-10-20 05:13:07,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-10-20 05:13:07,366 INFO L504 BasicCegarLoop]: Found error trace [2021-10-20 05:13:07,367 INFO L512 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1] [2021-10-20 05:13:07,408 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4af12e5f-6993-47fb-9b5f-47b57ca9c8f0/bin/utaipan-tZwUujhuQw/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-10-20 05:13:07,583 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4af12e5f-6993-47fb-9b5f-47b57ca9c8f0/bin/utaipan-tZwUujhuQw/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-20 05:13:07,584 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting fErr0ASSERT_VIOLATIONERROR_FUNCTION === [fErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-20 05:13:07,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-20 05:13:07,585 INFO L82 PathProgramCache]: Analyzing trace with hash 1410334125, now seen corresponding path program 2 times [2021-10-20 05:13:07,585 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-20 05:13:07,585 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [158038266] [2021-10-20 05:13:07,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-20 05:13:07,586 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-20 05:13:07,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-20 05:13:07,740 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 9 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-20 05:13:07,740 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-20 05:13:07,740 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [158038266] [2021-10-20 05:13:07,741 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [158038266] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-20 05:13:07,741 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [74703889] [2021-10-20 05:13:07,741 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-10-20 05:13:07,741 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-20 05:13:07,741 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4af12e5f-6993-47fb-9b5f-47b57ca9c8f0/bin/utaipan-tZwUujhuQw/z3 [2021-10-20 05:13:07,744 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4af12e5f-6993-47fb-9b5f-47b57ca9c8f0/bin/utaipan-tZwUujhuQw/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-20 05:13:07,763 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4af12e5f-6993-47fb-9b5f-47b57ca9c8f0/bin/utaipan-tZwUujhuQw/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-10-20 05:13:07,823 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-10-20 05:13:07,823 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-20 05:13:07,825 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 9 conjunts are in the unsatisfiable core [2021-10-20 05:13:07,827 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-20 05:13:07,914 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 15 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-20 05:13:07,915 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-20 05:13:07,974 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 9 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-20 05:13:07,975 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [74703889] provided 1 perfect and 1 imperfect interpolant sequences [2021-10-20 05:13:07,975 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2021-10-20 05:13:07,976 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [8, 8] total 8 [2021-10-20 05:13:07,976 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1848675081] [2021-10-20 05:13:07,977 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-10-20 05:13:07,977 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-20 05:13:07,978 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-10-20 05:13:07,978 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-10-20 05:13:07,979 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand has 8 states, 8 states have (on average 1.375) internal successors, (11), 5 states have internal predecessors, (11), 4 states have call successors, (4), 4 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-20 05:13:08,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-20 05:13:08,044 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2021-10-20 05:13:08,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-10-20 05:13:08,045 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.375) internal successors, (11), 5 states have internal predecessors, (11), 4 states have call successors, (4), 4 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 16 [2021-10-20 05:13:08,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-20 05:13:08,046 INFO L225 Difference]: With dead ends: 23 [2021-10-20 05:13:08,046 INFO L226 Difference]: Without dead ends: 14 [2021-10-20 05:13:08,049 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 64.7ms TimeCoverageRelationStatistics Valid=59, Invalid=97, Unknown=0, NotChecked=0, Total=156 [2021-10-20 05:13:08,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2021-10-20 05:13:08,054 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2021-10-20 05:13:08,055 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 9 states have (on average 1.0) internal successors, (9), 9 states have internal predecessors, (9), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-20 05:13:08,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 13 transitions. [2021-10-20 05:13:08,056 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 13 transitions. Word has length 16 [2021-10-20 05:13:08,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-20 05:13:08,057 INFO L470 AbstractCegarLoop]: Abstraction has 14 states and 13 transitions. [2021-10-20 05:13:08,057 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.375) internal successors, (11), 5 states have internal predecessors, (11), 4 states have call successors, (4), 4 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-20 05:13:08,057 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 13 transitions. [2021-10-20 05:13:08,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-10-20 05:13:08,067 INFO L504 BasicCegarLoop]: Found error trace [2021-10-20 05:13:08,068 INFO L512 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1] [2021-10-20 05:13:08,103 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4af12e5f-6993-47fb-9b5f-47b57ca9c8f0/bin/utaipan-tZwUujhuQw/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-10-20 05:13:08,283 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4af12e5f-6993-47fb-9b5f-47b57ca9c8f0/bin/utaipan-tZwUujhuQw/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-20 05:13:08,284 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting fErr0ASSERT_VIOLATIONERROR_FUNCTION === [fErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-20 05:13:08,285 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-20 05:13:08,285 INFO L82 PathProgramCache]: Analyzing trace with hash -1625650052, now seen corresponding path program 3 times [2021-10-20 05:13:08,285 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-20 05:13:08,285 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [781039440] [2021-10-20 05:13:08,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-20 05:13:08,286 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-20 05:13:08,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-10-20 05:13:08,317 INFO L354 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-10-20 05:13:08,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-10-20 05:13:08,371 INFO L133 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2021-10-20 05:13:08,371 INFO L626 BasicCegarLoop]: Counterexample is feasible [2021-10-20 05:13:08,373 INFO L764 garLoopResultBuilder]: Registering result UNSAFE for location fErr0ASSERT_VIOLATIONERROR_FUNCTION [2021-10-20 05:13:08,375 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-10-20 05:13:08,380 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-10-20 05:13:08,411 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.10 05:13:08 BoogieIcfgContainer [2021-10-20 05:13:08,411 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-10-20 05:13:08,412 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-10-20 05:13:08,412 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-10-20 05:13:08,412 INFO L275 PluginConnector]: Witness Printer initialized [2021-10-20 05:13:08,413 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.10 05:13:06" (3/4) ... [2021-10-20 05:13:08,417 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2021-10-20 05:13:08,456 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4af12e5f-6993-47fb-9b5f-47b57ca9c8f0/bin/utaipan-tZwUujhuQw/witness.graphml [2021-10-20 05:13:08,456 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-10-20 05:13:08,458 INFO L168 Benchmark]: Toolchain (without parser) took 2636.34 ms. Allocated memory was 88.1 MB in the beginning and 107.0 MB in the end (delta: 18.9 MB). Free memory was 66.6 MB in the beginning and 77.3 MB in the end (delta: -10.7 MB). Peak memory consumption was 7.1 MB. Max. memory is 16.1 GB. [2021-10-20 05:13:08,459 INFO L168 Benchmark]: CDTParser took 0.25 ms. Allocated memory is still 88.1 MB. Free memory was 64.3 MB in the beginning and 64.2 MB in the end (delta: 70.0 kB). There was no memory consumed. Max. memory is 16.1 GB. [2021-10-20 05:13:08,460 INFO L168 Benchmark]: CACSL2BoogieTranslator took 245.40 ms. Allocated memory is still 88.1 MB. Free memory was 66.6 MB in the beginning and 65.1 MB in the end (delta: 1.5 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2021-10-20 05:13:08,460 INFO L168 Benchmark]: Boogie Procedure Inliner took 30.01 ms. Allocated memory is still 88.1 MB. Free memory was 64.9 MB in the beginning and 63.6 MB in the end (delta: 1.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-20 05:13:08,461 INFO L168 Benchmark]: Boogie Preprocessor took 28.74 ms. Allocated memory is still 88.1 MB. Free memory was 63.6 MB in the beginning and 62.8 MB in the end (delta: 838.2 kB). There was no memory consumed. Max. memory is 16.1 GB. [2021-10-20 05:13:08,462 INFO L168 Benchmark]: RCFGBuilder took 341.08 ms. Allocated memory is still 88.1 MB. Free memory was 62.8 MB in the beginning and 53.8 MB in the end (delta: 9.0 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2021-10-20 05:13:08,463 INFO L168 Benchmark]: TraceAbstraction took 1939.20 ms. Allocated memory was 88.1 MB in the beginning and 107.0 MB in the end (delta: 18.9 MB). Free memory was 53.2 MB in the beginning and 79.5 MB in the end (delta: -26.3 MB). There was no memory consumed. Max. memory is 16.1 GB. [2021-10-20 05:13:08,463 INFO L168 Benchmark]: Witness Printer took 44.80 ms. Allocated memory is still 107.0 MB. Free memory was 79.5 MB in the beginning and 77.3 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-20 05:13:08,468 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.25 ms. Allocated memory is still 88.1 MB. Free memory was 64.3 MB in the beginning and 64.2 MB in the end (delta: 70.0 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 245.40 ms. Allocated memory is still 88.1 MB. Free memory was 66.6 MB in the beginning and 65.1 MB in the end (delta: 1.5 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 30.01 ms. Allocated memory is still 88.1 MB. Free memory was 64.9 MB in the beginning and 63.6 MB in the end (delta: 1.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 28.74 ms. Allocated memory is still 88.1 MB. Free memory was 63.6 MB in the beginning and 62.8 MB in the end (delta: 838.2 kB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 341.08 ms. Allocated memory is still 88.1 MB. Free memory was 62.8 MB in the beginning and 53.8 MB in the end (delta: 9.0 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * TraceAbstraction took 1939.20 ms. Allocated memory was 88.1 MB in the beginning and 107.0 MB in the end (delta: 18.9 MB). Free memory was 53.2 MB in the beginning and 79.5 MB in the end (delta: -26.3 MB). There was no memory consumed. Max. memory is 16.1 GB. * Witness Printer took 44.80 ms. Allocated memory is still 107.0 MB. Free memory was 79.5 MB in the beginning and 77.3 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0ms ErrorAutomatonConstructionTimeTotal, 0.0ms FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0ms ErrorAutomatonConstructionTimeAvg, 0.0ms ErrorAutomatonDifferenceTimeAvg, 0.0ms ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - CounterExampleResult [Line: 9]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L13] CALL f(4) VAL [\old(n)=4] [L6] COND FALSE !(n<3) [L7] n-- VAL [\old(n)=4, n=3] [L8] CALL f(n) VAL [\old(n)=3] [L6] COND FALSE !(n<3) [L7] n-- VAL [\old(n)=3, n=2] [L8] CALL f(n) VAL [\old(n)=2] [L6] COND TRUE n<3 VAL [\old(n)=2, n=2] [L8] RET f(n) VAL [\old(n)=3, n=2] [L9] reach_error() VAL [\old(n)=3, n=2] - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 11 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 1817.6ms, OverallIterations: 3, TraceHistogramMax: 4, EmptinessCheckTime: 18.4ms, AutomataDifference: 167.1ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 11.5ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 12 SDtfs, 18 SDslu, 24 SDs, 0 SdLazy, 58 SolverSat, 12 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 35.9ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 73 GetRequests, 50 SyntacticMatches, 3 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 144.1ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=14occurred in iteration=2, InterpolantAutomatonStates: 17, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 31.3ms AutomataMinimizationTime, 2 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 33.3ms SsaConstructionTime, 136.2ms SatisfiabilityAnalysisTime, 645.0ms InterpolantComputationTime, 65 NumberOfCodeBlocks, 65 NumberOfCodeBlocksAsserted, 8 NumberOfCheckSat, 72 ConstructedInterpolants, 0 QuantifiedInterpolants, 160 SizeOfPredicates, 5 NumberOfNonLiveVariables, 118 ConjunctsInSsa, 15 ConjunctsInUnsatCore, 6 InterpolantComputations, 1 PerfectInterpolantSequences, 33/51 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! [2021-10-20 05:13:08,524 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4af12e5f-6993-47fb-9b5f-47b57ca9c8f0/bin/utaipan-tZwUujhuQw/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Ended with exit code 0 Received shutdown request...